﻿// 
//    Copyright 2010 The JaernCloud Project
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
// 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using JaernCloud.Language.Compiler.Ast;
using System.Web.UI;

namespace JaernCloud.Language.Compiler.Types.Builtin.View {
    
    public class AnchorNodeType : AbstractHTMLElementType, IActionNodeType {
        

        public override AstTag GetRequiredAstTag() {
            return AstTag.FromName("a");
        }

        public override INodeType GetNodeTypeInstanceFor(AstNode node) {
            return new AnchorNodeType { SourceNode = node };
        }

        public override void Render(INodeType root, System.IO.TextWriter writer) {
            if (writer is HtmlTextWriter) {
                HtmlTextWriter htmlWriter = writer as HtmlTextWriter;
                htmlWriter.WriteBeginTag(Name);
                foreach (INodeType child in Children) {
                    if (child is IActionNodeType) {
                        IActionNodeType action = child as IActionNodeType;
                        string actionText = action.IsAjax ? "ajax " : String.Empty;
                        actionText += child.SourceNode.Tag.Name;
                        htmlWriter.WriteAttribute("onclick", "alert('" + actionText + "');");
                    }
                }
                htmlWriter.Write(HtmlTextWriter.TagRightChar);
                foreach (INodeType child in Children) {
                    if (child is IRenderNodeType) {
                        (child as IRenderNodeType).Render(this, htmlWriter);
                    }
                }
                htmlWriter.WriteEndTag(Name);
            } else {
                throw new ArgumentException("Expected writer as " + typeof(HtmlTextWriter));
            }
        }

        private IActionNodeType Action {
            get {
                foreach (INodeType child in Children) {
                    if (child is IActionNodeType) {
                        return child as IActionNodeType;
                    }
                }
                return null;
            }
        }

        public string ActionName {
            get {
                var a = Action;
                return a != null ? a.ActionName : String.Empty;
            }
        }

        public IActionNodeType Target {
            get {
                var a = Action;
                return a != null ? a.Target : null;
            }
        }

        public bool IsAsync {
            get {
                var a = Action;
                return a != null && a.IsAsync;
            }
        }

        public bool IsAjax {
            get {
                var a = Action;
                return a != null && a.IsAjax;
            }
        }

        public bool HasAction {
            get { return Action != null; }
        }

        public void ExecuteAction(IActionNodeTypeOwner owner, IList<INodeType> arguments = null) {
            var a = Action;
            if (a != null) {
                a.ExecuteAction(owner, arguments);
            }
        }
    }

}
